Battery cell, battery and electric device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. The battery cell comprises an insulating film and at least two pole groups, the insulating film covers the outer sides of the pole groups, and part of the insulating film extends between the two adjacent pole groups. The insulating film is arranged on the periphery of the pole group, and part of the insulating film extends between the two adjacent pole groups, so that in the acupuncture test process, when the probe penetrates through one pole group to reach the other pole group, the insulating film can wrap the probe and is not easy to shrink, the pole groups are isolated from the probe, the thermal runaway condition is avoided, and the safety of the battery cell is improved. According to the battery provided by the utility model, by applying the battery cell, the condition of thermal runaway can be avoided, and the battery has relatively high safety. According to the electric device provided by the utility model, by applying the battery cell or the battery, the service life and higher safety of the electric device are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially, relate to a kind of electric core, battery and electric device. BACKGROUND

[0002] Battery inevitably exists various improper use scenes in use process, for example, battery can be subjected to drop, impact, nail and extrusion etc. Mechanical action. In the above process, if the electric core of battery is pierced by the foreign matter with conductivity, the positive plate and negative plate in electric core are easy to be connected by foreign matter and generate short circuit, and then induce the thermal runaway of battery. Therefore, in the processing and manufacturing procedure of battery, to ensure the use safety of battery, battery needs to be tested. Needle test is one of safety test, which simulates the situation that foreign matter pierces electric core to induce electric core short circuit or thermal runaway by piercing probe into electric core.

[0003] In needle test process, after probe is pierced into electric core, it passes through several layers of plate, since diaphragm is arranged between positive and negative plate, and diaphragm has certain ductility, therefore, diaphragm can be wrapped around the outer periphery of probe, to avoid the contact between plate and probe. However, when battery contains multiple pole groups, probe contacts adjacent two pole groups when passing through one pole group to reach another pole group, which easily induces short circuit between adjacent two pole groups, and then causes thermal runaway of electric core, cannot meet detection requirement and actual demand, and the improvement of electric core safety needs to be improved.

[0004] Therefore, an electric core, battery and electric device are needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an electric core, battery and electric device, which can avoid the occurrence of thermal runaway and improve the safety of electric core.

[0006] To achieve the above-mentioned purpose, the following technical solutions are provided:

[0007] The electric core comprises:

[0008] At least two pole groups are arranged in sequence along a first direction.

[0009] An insulating film is wrapped outside the pole group, and part of the insulating film extends between adjacent two pole groups.

[0010] As an optional solution, the pole group comprises a first side wall, a second side wall and a bottom wall, and the first side wall is arranged opposite to the second side wall.

[0011] The insulation film comprises at least two protection parts, each of which corresponds to one of the pole groups, and each of the protection parts comprises two first parts and a second part, the two first parts are arranged at two ends of the second part along the first direction, and the two first parts are opposite to the first side wall and the second side wall respectively, and the second part is opposite to the bottom wall.

[0012] As an option, the protection part further comprises an extension part connected to one end of the first part or the second part along a second direction, and the pole group further comprises a third side wall and a fourth side wall, the third side wall and the fourth side wall are arranged opposite to each other and perpendicular to the second direction, and the extension part is opposite to the third side wall or the fourth side wall.

[0013] As an option, the insulation film is provided with a first connecting part at one end close to the cover plate assembly, and the first connecting part is configured to be connected with a lower plastic part of the battery.

[0014] A battery comprises a shell, a cover plate assembly and the above-mentioned battery cell, wherein the battery cell is placed in the shell, the cover plate assembly covers the open end of the shell, and the pole lug on the battery cell is electrically connected with the pole column on the cover plate assembly.

[0015] As an option, the cover plate assembly comprises a lower plastic part opposite to the top of the battery cell, and one end of the insulation film away from the bottom wall is connected with the lower plastic part.

[0016] As an option, the insulation film is provided with a first connecting part at one end away from the second part, and the lower plastic part is provided with a second connecting part, and the first connecting part and the second connecting part are inserted and matched.

[0017] As an option, the first connecting part is a protrusion, and the second connecting part is a through hole or a groove; or

[0018] The first connecting part is a through hole, and the second connecting part is a protrusion.

[0019] As an option, the insulation film and the lower plastic part are fixed by ultrasonic welding.

[0020] An electric device comprises the above-mentioned battery cell or the above-mentioned battery.

[0021] Compared with the prior art, the battery cell and the battery have the following beneficial effects:

[0022] The electric core provided by the utility model includes an insulating film, the insulating film is wrapped outside the pole group, and part of the insulating film extends between the adjacent two pole groups. By arranging the insulating film on the outer periphery of the pole group, and part of the insulating film extending between the adjacent two pole groups, in the process of the needle test, when the probe passes through one pole group to reach another pole group, the insulating film can wrap the probe, and is not easy to shrink, thereby isolating the pole group from the probe, avoiding the occurrence of the thermal runaway, and improving the safety of the electric core.

[0023] The battery provided by the utility model can avoid the occurrence of the thermal runaway, and has high safety.

[0024] The electric device provided by the utility model can ensure the service life and high safety of the electric device by using the above electric core or battery. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by the ordinary skilled in the art without creating labor.

[0026] Figure 1 The structural schematic view of the battery provided by the embodiments of the utility model is shown in the figure.

[0027] Figure 2 The sectional view of the electric core provided by the embodiments of the utility model is shown in the figure.

[0028] Figure 3 The structural schematic view of the insulating film provided by the embodiments of the utility model is shown in the figure.

[0029] REFERENCE SIGNS:

[0030] 1000, battery;

[0031] 100, electric core;

[0032] 10, insulating film; 11, protection part; 111, first part; 112, second part; 113, extension part; 114, first connecting part;

[0033] 20, pole group;

[0034] 200, cover plate assembly; 210, lower plastic part; 220, top cover sheet; 2201, liquid injection hole; 230, pole; 240, connecting sheet; 250, explosion-proof sheet;

[0035] 300, shell. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. Accordingly, the present application should not be limited by the following description and examples.

[0037] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features limited by "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0039] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0042] The embodiment provides a power utilization device, which comprises a battery and a power utilization mechanism, the battery is used to supply power to the power utilization mechanism, so that the power utilization mechanism automatically completes a preset action through electric energy, ensures good use performance of the power utilization mechanism, saves manpower, and improves productivity.

[0043] Specifically, the power utilization device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, or an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile or a hybrid electric automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, or an electric planer, etc. The embodiment does not limit the above power utilization device.

[0044] The number of the battery provided in the embodiment can be one or more. For example, the battery mentioned in the present application can be a battery monomer, a battery module, or a battery pack, etc.

[0045] Each battery can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0046] For example, the battery can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. Figure 1As shown in FIG. 1, the battery 1000 provided by the embodiment includes a shell 300 and a battery cell 100, the battery cell 100 is accommodated in the shell 300, and the shell 300 achieves the effect of better supporting and protecting the battery cell 100. The battery 1000 further includes a cover plate assembly 200, the top end of the shell 300 is provided in an open manner, the cover plate assembly 200 is arranged at the open end of the shell 300, the cover plate assembly 200 forms a sealed space with the shell 300, and the cover plate assembly 200 achieves the effect of encapsulating the battery cell 100.

[0047] As shown in FIG. 1, the number of the battery cell 100 is two, and the two battery cells 100 are assembled in a series or parallel manner. In other embodiments, the number of the battery cell 100 can also be one, three or more, which is not limited herein.

[0048] It should be noted that the electric device can also directly use the above-mentioned battery cell 100 to supply power to the electric mechanism.

[0049] As shown in FIG. 1, Figure 1 The cover plate assembly 200 includes two polar posts 230 and two connecting pieces 240. One of the two polar posts 230 is a positive polar post, and the other is a negative polar post. One of the two connecting pieces 240 is a positive connecting piece, and the other is a negative connecting piece. The positive electrode of the battery cell 100 is connected to the positive polar post through the positive connecting piece, and the negative electrode of the battery cell 100 is connected to the negative polar post through the negative connecting piece. The top surface of the polar post 230 is connected to the electric mechanism, thereby achieving the power supply function of the battery cell 100 to the electric mechanism.

[0050] Further, the cover plate assembly 200 further includes a top cover piece 220 and an explosion-proof piece 250. The top cover piece 220 is provided with an explosion-proof hole, and the explosion-proof piece 250 is welded in the explosion-proof hole. In use, when gas is generated in the shell 300 and the gas pressure in the shell 300 reaches the explosion-proof threshold of the explosion-proof piece 250, the explosion-proof piece 250 is broken, and the gas is discharged from the explosion-proof hole, thereby avoiding the explosion of the shell 300 and improving the safety of the battery 1000.

[0051] The top cover piece 220 is provided with a liquid injection hole 2201, and electrolyte is injected into the accommodating cavity of the shell 300 through the liquid injection hole 2201, so that the battery cell 100 is immersed in the electrolyte, thereby achieving the charging and discharging function of the battery cell 100.

[0052] As shown in FIG. 1, the cover plate assembly 200 further includes a lower plastic piece 210, which is arranged at the lower end of the top cover piece 220 and connected to the top cover piece 220. The lower plastic piece 210 mainly plays the role of insulating and fixing the battery cell 100.

[0053] During assembly, the positive and negative connecting pieces are first connected with the battery cell 100, and then the positive and negative connecting pieces are welded with the positive and negative poles respectively, and then the two poles 230 pass through the lower plastic part 210 and the top cover 220, and then the battery cell 100 is placed in the shell 300, and the cover plate assembly 200 is sealed with the shell 300, and then a series of processes such as liquid injection, formation and capacity are performed to obtain the battery 1000.

[0054] As shown in Figure 2 , the battery cell 100 includes a pole group 20, the pole group 20 includes a positive plate, a negative plate and a separator, the positive plate and the negative plate are respectively responsible for storing positive and negative charges, and the separator plays a role of separating the two poles. When an external load is connected to the battery, an electron flow and an ion flow will be formed inside the pole group 20, thereby generating an electric current. Among them, the positive plate, the negative plate and the separator form the pole group 20 through a winding or a laminating process.

[0055] In this embodiment, the number of pole groups 20 is two, and the two pole groups 20 are arranged in sequence along the first direction. In other embodiments, the number of pole groups 20 can also be three, four or more.

[0056] During the needle test process, when the probe passes through one of the pole groups 20 to reach the other pole group 20, the adjacent two pole groups 20 are in contact with the probe, which is easy to cause short circuit between the adjacent two pole groups 20, and further cause thermal runaway of the battery cell 100, which cannot meet the detection requirements and actual needs, and the improvement of the safety of the battery cell 100 needs to be improved.

[0057] In order to solve the above problems, as shown in Figure 2 , the battery cell 100 provided in this embodiment further includes an insulating film 10, the insulating film 10 is wrapped outside the pole group 20, and part of the insulating film 10 extends into the adjacent two pole groups 20. By arranging the insulating film 10 outside the pole group 20, and part of the insulating film 10 extending into the adjacent two pole groups 20, when the probe passes through one of the pole groups 20 to reach the other pole group 20 during the needle test process, the insulating film 10 can wrap the probe and is not easy to shrink, thereby isolating the pole group 20 from the probe, avoiding the occurrence of thermal runaway, and improving the safety of the battery cell 100.

[0058] Specifically, as shown in Figure 2 and Figure 3As shown, the insulation film 10 includes at least two continuous protection parts 11, and each protection part 11 corresponds to one pole group 20, the protection part 11 includes a first part 111 and a second part 112, the number of the first part 111 is two, and the two first parts 111 are arranged at two ends of the second part 112 along a first direction, the pole group 20 includes a first side wall, a second side wall, and a bottom wall, the first side wall and the second side wall are oppositely arranged, the two first parts 111 are respectively opposite to the first side wall and the second side wall, and the second part 112 is opposite to the bottom wall. By arranging the insulation film 10 on the outer periphery of the pole group 20, and there are two layers of the first part 111 between the adjacent two pole groups 20, the two layers of the first part 111 isolate the pole group 20 from the probe during the needle test, and the safety of the battery cell 100 is further improved.

[0059] Optionally, the protection part 11 includes an extension part 113, the extension part 113 is connected to one end of the first part 111 or the second part 112 along a second direction, and the pole group 20 further includes a third side wall and a fourth side wall, the third side wall and the fourth side wall are oppositely arranged and perpendicular to the second direction, and the extension part 113 is opposite to the third side wall or the fourth side wall, so as to improve the protection effect on the pole group 20.

[0060] Specifically, the first part 111 is the same in shape and size as the first side wall and the second side wall, the second part 112 is the same in shape and size as the bottom wall, and the extension part 113 is the same in shape and size as the third side wall and the fourth side wall, so as to completely wrap the pole 230 and improve the protection effect on the pole group 20.

[0061] Optionally, the insulation film 10 is integrally formed. Specifically, the insulation film 10 can be cut according to the size of the battery cell 100.

[0062] Optionally, the insulation film 10 is provided with a first connecting part 114 at one end close to the cover plate assembly 200, the first connecting part 114 is configured to be connected with a lower plastic part 210 of the battery 1000, so as to fix the insulation film 10. Wherein, the lower plastic part 210 is opposite to the top of the battery cell, and one end of the insulation film 10 away from the bottom wall is connected with the lower plastic part 210.

[0063] Optionally, the lower plastic part 210 is provided with a second connecting part, and the first connecting part 114 is inserted and matched with the second connecting part.

[0064] Specifically, the first connecting part 114 is a protrusion, and the second connecting part is a through hole or a groove; or the first connecting part 114 is a through hole, and the second connecting part is a protrusion.

[0065] In an optional embodiment, the insulating film 10 is fixed to the lower plastic part 210 by ultrasonic welding. The ultrasonic welding of the insulating film 10 to the lower plastic part 210 has the advantages of fast welding speed, high strength, good sealing, low cost, no pollution, no damage to the workpiece, stable welding process, etc.

[0066] In order to improve the covering effect of the insulating film 10 on the probe, the elongation of the insulating film 10 is 80%-100%. When the probe penetrates into the pole group 20 from the outside of the insulating film 10, the insulating film 10 can be wrapped around the outer periphery of the insertion end of the probe due to its excellent elongation.

[0067] Optionally, the material of the insulating film 10 can be, but is not limited to, PET (polyethylene glycol terephthalate), PTFE (Polytetrafluoroethylene) or PAN (polyacrylonitrile). It can be understood that the above-mentioned materials are only exemplary descriptions, and in other embodiments, the specific material of the insulating film 10 can be adjusted according to actual needs, and the present embodiment is not limited.

[0068] It is noted that in the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] The above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A battery cell, characterized in that, include: At least two pole groups (20) are arranged sequentially along the first direction; An insulating film (10) covers the outside of the electrode group (20), and part of the insulating film (10) extends into the space between two adjacent electrode groups (20); The pole group (20) includes a first sidewall, a second sidewall, and a bottom wall, wherein the first sidewall and the second sidewall are disposed opposite to each other; The insulating film (10) includes at least two consecutive protective portions (11), and each protective portion (11) corresponds to one of the pole groups (20). The protective portion (11) includes two first portions (111) and a second portion (112). The two first portions (111) are disposed at both ends of the second portion (112) along the first direction. The two first portions (111) are respectively opposite to the first sidewall and the second sidewall, and the second portion (112) is opposite to the bottom wall. The protective part (11) further includes an extension (113), which is connected to one end of the first part (111) or the second part (112) along the second direction. The pole group (20) further includes a third sidewall and a fourth sidewall, which are disposed opposite to each other and perpendicular to the second direction. The extension (113) is opposite to the third sidewall or the fourth sidewall.

2. The battery cell according to claim 1, characterized in that, The insulating film (10) has a first connecting portion (114) at one end near the cover plate assembly (200), and the first connecting portion (114) is configured to connect to the lower plastic part (210) of the battery.

3. A battery, characterized in that, The device includes a housing (300), a cover assembly (200), and a battery cell as described in any one of claims 1-2, wherein the battery cell is placed inside the housing (300), the cover assembly (200) covers the open end of the housing (300), and the tabs on the battery cell are electrically connected to the terminals (230) on the cover assembly (200).

4. The battery according to claim 3, characterized in that, The cover plate assembly (200) includes a lower plastic part (210) which is opposite to the top of the battery cell, and the end of the insulating film (10) facing away from the bottom wall is connected to the lower plastic part (210).

5. The battery according to claim 4, characterized in that, The insulating film (10) has a first connecting part (114) at one end away from the second part (112), and the lower plastic part (210) has a second connecting part. The first connecting part (114) and the second connecting part are inserted into each other.

6. The battery according to claim 5, characterized in that, The first connecting part (114) is a protrusion, and the second connecting part is a through hole or a groove; or The first connecting part (114) is a through hole, and the second connecting part is a protrusion.

7. The battery according to claim 4, characterized in that, The insulating film (10) and the lower plastic part (210) are fixed together by welding.

8. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-2 or the battery as described in any one of claims 3-7.

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